ok - this stuff is very specific to a certain situation. and bizarre, i might add.
it's like this - rendering over mapped network drives with After Effects to from a synology box (1511+), there's random errors that sometimes cause AE to abort with error, like this:http://www.pipelinefx.com/forum/index.php?topic=812.0
and sometimes they just produce faulty (flash) frames in the target video file. this is a big render, so let's say over the course of 5 hour render of 20k frames, there's maybe 10 flash frames. don't know if they're caused by faulty write or a faulty read.
this started happening when i went from 411+ to 1511+; and has been driving me bonkers for the past several months.
rendering over network on another win7 box works without a glitch, so likely the problem is not in the network switch or cabling.